JP2012207297A - Electromagnetic vibration suppression device, and electromagnetic vibration suppression control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic vibration suppression device capable of appropriately suppressing the vibration of a steel sheet traveling in a meandering manner in the width direction in a state of being curved in its thickness direction and without requiring an exclusive edge position detection sensor nor a meandering amount detection apparatus even in usage environments where any meandering amount is not provided by a host computer.SOLUTION: In the electromagnetic vibration suppression device 1, a plurality of electromagnet pairs 2 are arranged in the width direction of a steel sheet S, and the vibration of the steel sheet S traveling between the electromagnets 2A, 2B of each electromagnet pair 2 is suppressed by a control unit 4. The control unit 4 includes: a pseudo displacement calculating means 41 for calculating the pseudo displacement of the steel sheet S on the basis of switching between the ON-OFF states of a sensor 3 attached to the electromagnet pairs 2; a steel sheet correction target position calculating means 42 for calculating the correction target position of the steel sheet S in each electromagnet pair 2 on the basis of the pseudo displacement; and a current amount control means 43 for individually controlling the amount of current that flows to the electromagnets 2A, 2B so that the position of the steel sheet S in each electromagnet pair 2 becomes the correction target position.

Description

  The present invention relates to an electromagnetic damping device capable of preventing / suppressing vibration of a steel plate being conveyed by a current output from an electromagnet, and an electromagnetic damping control program applicable to such an electromagnetic damping device. is there.

  Conventionally, for example, in a continuous hot dip galvanizing line, pressurized air or pressurized gas from an air knife part (for example, one configured using an air nozzle) to a steel plate that travels while being pulled up through a hot dip galvanizing tank. The excess molten zinc is blown off by jetting out to form a desired plating thickness. In such a case, if the steel plate vibrates in the direction in which it is in contact with or separated from the air knife part, the distance between the nozzle and the steel plate will change, and as a result, the pressure (injection force) received by the steel plate will change and the plating thickness will change. May become non-uniform, leading to quality degradation.

  In view of this, an electromagnetic damping device is conceived that controls the attraction force of the electromagnet to control the vibration of the traveling steel sheet by controlling the current flowing through the electromagnet arranged opposite to the position sandwiching the traveling steel sheet (for example, a patent) Reference 1). In this type of electromagnetic vibration control device, a plurality of electromagnet pairs including electromagnets arranged opposite to each other in the thickness direction of the steel plate are arranged in the width direction of the steel plate, and each displacement sensor that detects a relative position (distance) with the steel plate is provided. Provided in association with the electromagnet, and configured to control the current flowing through the electromagnet of each electromagnet pair based on the relative position (distance) with the steel plate detected by each displacement sensor.

  In addition, attempts have been made to increase the rigidity of the steel plate itself being conveyed by conveying the steel plate in a state curved in the width direction. In this case, the curved shape of the steel plate that can exhibit appropriate damping control by the electromagnetic damping device is preset, and in the electromagnetic damping device, each electromagnet pair is configured so that the steel plate has the desired curved shape. The output current of the electromagnet is controlled.

JP 2009-179834 A

  By the way, a steel plate traveling between opposing electromagnets may meander in the width direction. Even when meandering occurs, if the output current of each electromagnet is controlled at the desired set value, the steel plate is thickened by the electromagnetic attraction force of the electromagnet output at the desired set value at the meandering position. There is a possibility that the shape in the direction is different from the intended curved shape (for example, a distorted shape in which the left and right are not asymmetric). And the problem that a stable damping action cannot be exhibited with respect to the steel plate which drive | works with the shape different from the expected curved shape, and appropriate control becomes difficult is assumed.

  Therefore, the applicant of the present invention is able to convey the vibration of the steel sheet by enabling conveyance while maintaining the intended curved shape even when the steel sheet traveling in the thickness direction is meandering in the width direction. As an electromagnetic damping device that can be appropriately suppressed, each electromagnet pair is configured to have a desired curved shape based on a displacement amount in the width direction of the steel sheet input in real time or every predetermined time. Steel plate correction target position calculating means for calculating the correction target position of the steel plate between the electromagnets, and each of the steel plates displaced in the width direction are moved to the correction target position of the steel plate in each electromagnet pair obtained by the steel plate correction target position calculation means. An electromagnetic damping device using a control unit having current amount control means for individually controlling the amount of current flowing through the electromagnets constituting the electromagnet pair has been developed and has already been applied for a patent (Japanese Patent Application No. 2010-64842).

  However, in the above aspect, the amount of displacement (meandering amount) in the width direction of the steel plate from a device different from the electromagnetic damping device (for example, a host computer) or a part of the electromagnetic damping device (for example, a meandering amount detection device). Is assumed to be input. Therefore, it was considered desirable to perform damping control by judging the amount of displacement of the steel sheet by the electromagnetic damping device itself under the use conditions where this precondition is not satisfied.

  The present invention has been made paying attention to such a problem, and its main purpose is to make a dedicated sensor for edge position detection and a special meandering amount detection device without an indispensable structure, a high-level computer, etc. Even in an environment where information on the amount of meandering is not provided, the steel plate meandered in the width direction can be transported while maintaining the desired curved shape, and electromagnetic waves that can appropriately suppress vibrations of this steel plate. The object is to provide a vibration damping device.

  That is, according to the present invention, a plurality of electromagnet pairs, which are a set of electromagnets arranged opposite to each other in the thickness direction of a steel plate traveling in a predetermined direction, are arranged in the width direction of the steel plate, and each electromagnet pair is controlled by a controller that controls a current flowing through each electromagnet. The present invention relates to an electromagnetic damping device that suppresses vibrations of a steel plate that travels between electromagnets in a shape curved in the direction in which these electromagnets face each other. Here, examples of the “curved shape of the steel plate” include a general partial arc (including a partial elliptical arc (including a bow)) and a shape (a wave shape, an S-shape) obtained by combining a plurality of partial arcs. it can. In the electromagnetic damping device of the present invention, the conveying direction of the steel plate is not particularly limited, and the steel plate that passes between the electromagnets while being pulled up, the steel plate that is passed between the electromagnets while being pulled down, or a horizontal plate Even a steel plate that passes between electromagnets while being moved to a position, or a steel plate that is conveyed in any of these directions, is a vibration suppression target of the electromagnetic vibration control device of the present invention.

  And, the electromagnetic damping device according to the present invention is applied to each electromagnet pair excluding the electromagnet pair arranged in the width direction central portion or in the vicinity of the width direction central portion of the electromagnet pair region in which a plurality of electromagnet pairs are arranged in the width direction. A sensor capable of detecting the presence or absence of the steel plate is attached between the electromagnets of the electromagnet pair, and as a control unit, from the steel plate center position, which is the center position in the width direction of the steel plate in a normal state not meandering in the width direction, between the electromagnets of the electromagnet pair Among the sensors that were switched from the on state where the presence of the steel plate was detected to the off state where the presence of the steel plate was not detected between the electromagnets of the electromagnet pair, the sensor closest to the center in the width direction of the electromagnet pair region, or turned on from the off state To the switching sensor reference position based on the position of at least one of the sensor positions farthest from the center in the width direction of the electromagnet pair region among the sensors switched to the state. And a difference between the half of the width of the steel sheet as a pseudo displacement amount of the steel plate, a pseudo displacement amount calculating means for calculating the desired curved shape based on the pseudo displacement amount calculated by the pseudo displacement amount calculating means, The steel plate correction target position calculation means for calculating the correction target position of the steel plate between the electromagnets constituting each electromagnet pair and the steel plate in each electromagnet pair obtained by the steel plate correction target position calculation means for the steel plate displaced in the width direction. The present invention is characterized in that current amount control means for individually controlling the amount of current flowing through the electromagnets constituting each electromagnet pair so as to be moved to the correction target position is applied.

  Note that the output source that outputs the width dimension of the steel plate to the control unit may be either a device different from the electromagnetic vibration control device (for example, a host computer) or a part of the electromagnetic vibration control device. Further, “the correction target position of the steel plate in each electromagnet pair” is synonymous with “the correction target position of the steel plate between the electromagnets constituting each electromagnet pair”, and “the position of the steel plate in the electromagnet pair” for convenience in the following description. The description is synonymous with “position of the steel plate between the electromagnets constituting the electromagnet pair”. Moreover, the timing which calculates the pseudo displacement amount of a steel plate, and the timing which calculates the correction | amendment target position of a steel plate based on pseudo displacement amount should just be real time or every predetermined time.

  With such an electromagnetic vibration control device, the pseudo displacement of the control unit can be obtained even in an environment where information on the actual displacement (meandering amount) of the steel sheet is not input to the control unit from the outside such as a host computer. Among the sensors switched from the on state to the off state by the quantity calculation unit, the position of the sensor (innermost sensor) closest to the center in the width direction of the electromagnet pair region, or the electromagnet among the sensors switched from the off state to the on state A switching sensor reference position is determined based on the position of the sensor (outermost sensor) farthest from the center in the width direction of the paired region, and information on the switching sensor reference position and the width dimension of the steel sheet is used to pseudo-displace the steel sheet. The amount (pseudo meandering amount of the steel plate) can be calculated and obtained. The pseudo displacement amount calculation unit obtains the approximate displacement amount of the steel sheet as the pseudo displacement amount based on the position information (switching sensor reference position) of the sensor switched between the on state and the off state. Is unlikely to match the actual displacement of the steel sheet. However, the error between the actual displacement amount and the pseudo displacement amount does not normally become larger than the distance between adjacent sensors, and is unlikely to be a problem in actual operation. Paying attention to this point, the present inventor has made active correction of the steel plate between the electromagnets constituting each pair of electromagnets so as to obtain the desired curved shape by the steel plate correction target position calculation means by actively using the pseudo displacement amount. A configuration has been devised in which the position is calculated and the current flowing through each electromagnet is individually adjusted by the current amount control means based on the correction target position obtained by the calculation process by the steel plate correction target position calculation means. By adopting such a configuration, the steel plate in each electromagnet pair can be used even in an environment where information on the actual displacement (meandering amount) of the steel plate is not input to the control unit from the outside such as a host computer. The position can be moved to the correction target position, and even when the steel plate meanders, the steel plate can be guided (corrected) to the same or substantially the same curved shape as the intended curved shape at the meandering position. Therefore, if the electromagnetic damping device of the present invention that exerts an appropriate vibration damping action on a steel plate traveling in the desired curved shape, the steel plate at the meandering position of the steel plate By maintaining the curved shape, it is possible to appropriately suppress the vibration of the steel plate running meandering.

  Further, in the electromagnetic damping device of the present invention, the curved shape of the steel plate before the displacement in the width direction, that is, the straight line connecting the desired curved shape of the steel plate between the desired target positions of the steel plate in each adjacent electromagnet pair For each electromagnet pair, the steel plate correction target position calculation means is adjacent to each target position and pseudo displacement amount of the steel plate in the electromagnet pair for which the correction target position of the steel plate is obtained and the electromagnet pair adjacent to the electromagnet pair. The correction target position of the steel sheet can be calculated using the distance between the electromagnet pair. Here, the “desired target position of the steel plate in each electromagnet pair” is a target position of the steel plate that is set in advance or in real time for each electromagnet pair so as to have a desired curved shape without being meandered. . As a specific example of the “desired target position of the steel plate in each electromagnet pair”, five electromagnet pairs are arranged at a predetermined pitch in the width direction of the steel plate, and the width direction center of the steel plate not meandering with the central electromagnet pair When transporting a symmetric partial arc-shaped steel plate with an electromagnetic vibration control device that is matched or substantially matched, the desired position of the steel plate in the electromagnet pair at both ends (both ends) is opposed to the electromagnets that make up each electromagnet Electromagnet pair that is coincident or substantially coincides with the direction in which both ends are adjacent to each other (first electromagnet pair, second electromagnet pair, third electromagnet pair, fourth electromagnet pair, fifth electromagnet pair in order from one end side) Then, the intended target position of the steel plate in the second electromagnet pair and the fourth electromagnet pair) coincides or substantially coincides with the direction in which the electromagnets constituting each electromagnet pair face each other.

  In the present invention, the desired curved shape of the steel plate is approximated to a shape in which the desired target positions of the steel plates in the adjacent electromagnet pairs are connected with a straight line, and even if the steel plate is meandering, the shape of the steel plate approximated with a straight line Based on the technical idea that the steel plate becomes the same or substantially the same shape as the intended curved shape even at the meandering position if it is held in a state of being translated in the width direction of the steel plate, the steel plate correction target position calculating means, By using the desired target position of the steel plate in each electromagnet pair, the distance between adjacent electromagnet pairs, and the pseudo meandering amount of the steel plate, the correction target position of the steel plate in each electromagnet pair can be calculated respectively. Yes. If it is such an aspect, in addition to the “predetermined target position of the steel plate in each electromagnet pair” and “distance between adjacent electromagnet pairs” which are preset default values, it is calculated in real time or every predetermined time. The correction target position of the steel plate in each electromagnet pair can be obtained with a small calculation amount by the steel plate correction target position calculation means only by using the “pseudo displacement amount of the steel plate”.

  As a suitable example of the arithmetic processing in the steel plate correction target position calculation means, an intended target position of the steel plate in an electromagnet pair (hereinafter referred to as “correction target position calculation target electromagnet pair”) for which a correction target position of the steel plate is obtained, The target position of the steel plate in the electromagnet pair adjacent to the target electromagnet pair to be corrected is calculated as coordinates on a common plane, and the difference between these coordinates, more specifically, the opposing direction of the electromagnets constituting the electromagnet pair And the difference between the correction target position of the steel plate in the correction target position calculation target electromagnet pair and the desired target position of the steel plate in the electromagnet pair adjacent to the correction target position calculation target electromagnet pair. The first relative ratio, which is the ratio of the difference between these two calculation results, is the distance between adjacent electromagnet pairs and the pseudo displacement of the steel sheet is calculated from this distance. The ratio of the value calculated have utilized is equal to the second relative ratio, the arithmetic processing and the like to obtain the corrected target position of the steel sheet in each electromagnet pair respectively.

  In the electromagnetic damping device of the present invention, the current amount control means may control the output intensity of the current as “current amount control”. However, in the case of a simple control specification, the electromagnet is excited. It is possible to adopt a mode in which the amount of output current from each electromagnet is set to either zero or a predetermined value of zero or more by switching only between the state and the non-excited state (current on / off) preferable.

  The electromagnetic damping control program of the present invention is a program applied to the electromagnetic damping device having the above-described configuration, and a steel plate center position that is a center position in the width direction of the steel plate in a normal state that does not meander in the width direction. Of the sensor closest to the center in the width direction of the electromagnet pair region from the on state where the presence of the steel plate is detected between the electromagnets of the electromagnet pair to the off state where the presence of the steel plate is not detected between the electromagnets of the electromagnet pair. The position or the distance to the switching sensor reference position based on at least one of the positions of the sensors farthest from the center in the width direction of the electromagnet pair region among the sensors switched from the off state to the on state, and the width dimension of the steel plate Based on the pseudo displacement amount calculating step of calculating the difference between the half length as the pseudo displacement amount of the steel sheet and the pseudo displacement amount calculated in the pseudo displacement amount calculating step. The steel plate correction target position calculation step for calculating the correction target position of the steel plate between the electromagnets constituting each electromagnet pair so as to obtain the desired curved shape, and the steel plate displaced in the width direction in the steel plate correction target position calculation step A current amount control step of individually controlling the amount of current flowing through the electromagnets constituting each electromagnet pair so as to be moved to the correction target position of the steel plate in each obtained electromagnet pair is characterized. With such an electromagnetic vibration suppression control program, the curved shape of the steel plate that runs meandering can be conveyed while maintaining the desired curved shape, and vibration during traveling can be effectively suppressed. .

  According to the electromagnetic damping device of the present invention, a dedicated edge position detection sensor and a meandering amount detection device are not required even in a use environment where the meandering amount of the steel sheet is not provided from a host computer. It is possible to suppress the vibration of the steel plate that travels without meandering in the curved shape of the period, and it is also possible to effectively suppress the vibration of the steel plate that runs meandering in the curved shape.

BRIEF DESCRIPTION OF THE DRAWINGS The whole structure schematic diagram of the electromagnetic damping device which concerns on one Embodiment of this invention. The a direction schematic arrow view of FIG. The b direction schematic arrow view of FIG. The functional block diagram of the control part in the electromagnetic damping device which concerns on the embodiment. FIG. 4 is a partially enlarged view of FIG. 3. The figure which shows the state which approximated the curve shape of the steel plate shown in FIG. 3 with the straight line. The figure which shows the right triangle which makes the straight line which approximated the curved shape of the steel plate between the adjacent electromagnets before and behind meandering one side. The figure which shows the shape of the steel plate at the time of carrying out vibration suppression control based on the desired target position after meandering corresponding to FIG. The flowchart of the electromagnetic damping control program used for the electromagnetic damping device which concerns on the embodiment. The figure which shows the shape of the steel plate at the time of carrying out vibration suppression control based on the correction | amendment target position after meandering corresponding to FIG. The conceptual diagram at the time of calculating the pseudo displacement amount in the embodiment. The conceptual diagram at the time of calculating the pseudo displacement amount in the embodiment. The conceptual diagram at the time of calculating the pseudo displacement amount in the embodiment. The conceptual diagram at the time of calculating the pseudo displacement amount in the embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the electromagnetic damping device 1 according to the present embodiment is disposed downstream of the molten metal tank (in the embodiment, the molten zinc tank Z is applied) in the continuous plated steel plate line L, The vibration of the steel sheet S that travels while being pulled up through the zinc tank Z is suppressed. In addition, in FIG. 1, the state which looked at the steel plate S from the side is shown typically, and in FIG. 2, the a direction arrow view of FIG. 1 is shown typically. FIG. 3 is a diagram schematically showing a state in which the traveling steel sheet S is viewed from above (direction b in FIG. 1). In FIG. 1, the steel sheet S is represented by a single solid line for convenience, but the electromagnetic damping device 1 according to the present embodiment travels in a predetermined direction with a curved shape in the thickness direction as shown in FIG. 3. It can exhibit a damping effect on the steel sheet S. In particular, the electromagnetic damping device 1 of the present embodiment can exhibit a stable damping action on a steel sheet S curved in a partial arc shape (partial elliptic arc shape) as shown in FIG.

  The continuous plated steel plate line L (particularly, the plated steel plate line using molten zinc is referred to as “continuous galvanizing line” (CGL)) is located between the molten zinc tank Z and the electromagnetic damping device 1. The air knife part A provided with the nozzle A1 with the jet port directed to the steel sheet S is provided, and the pressurized air or the pressurized air from the jet port of each nozzle A1 with respect to the steel plate S traveling while being pulled up through the molten zinc tank Z Excess molten zinc is blown off by jetting pressurized gas. As the molten zinc tank Z and the air knife part A, known ones can be applied, and detailed description thereof is omitted.

  As shown in FIGS. 2 and 3, the electromagnetic vibration damping device 1 includes an electromagnet pair 2 that is a set of the first electromagnet 2A and the second electromagnet 2B that are opposed to each other at a position where the steel plate S can be sandwiched in the thickness direction. A plurality (five or more electromagnet pairs 2 in FIG. 2 and five electromagnet pairs 2 for convenience of explanation in FIG. 3) are arranged at a predetermined pitch in the width direction. In addition, in FIG. 2, the near side steel plate S is actually shown with the broken line. The first electromagnet 2A and the second electromagnet 2B constituting each electromagnet pair 2 are each composed of an iron core 21 having a U-shaped cross section or a substantially U-shaped cross section, and a coil 22 wound around each leg portion of the iron core 21. This is a known one that can be switched between an excitation state in which a magnetic attraction force can be output from the iron core 21 and a non-excitation state in which the magnetic attraction force is not output from the iron core 21 depending on whether or not power is supplied to the coil 22. In the present embodiment, a plurality of electromagnet pairs 2 are arranged at a predetermined pitch in the width direction of the steel plate S, and the electromagnet pair region is in a normal posture (hereinafter referred to as “normal posture”) without the steel plate S meandering. When traveling 2X, as shown in FIG. 2, the width direction center Sc of the steel sheet S is coincident with the width direction center 2Xc of the region (electromagnet pair region) 2X in which the plurality of electromagnet pairs 2 are disposed, When three or more odd pairs of electromagnet pairs 2 are arranged in the width direction in the electromagnet pair region 2X, the center in the width direction of the electromagnet pair 2 disposed in the middle and the center in the width direction 2Xc of the electromagnet pair region 2X are matched. . In FIG. 3, the center in the width direction of each electromagnet pair 2 is indicated by a broken line, and the middle between the first electromagnet 2A and the second electromagnet 2B is indicated by a one-dot chain line.

  The electromagnetic damping device 1 includes first sensors 3A, 3B and a second sensor 3A that detect the distance to the steel sheet S on the surface of the first electromagnet 2A and the second electromagnet 2B facing the steel sheet S. 3B is provided. In the present embodiment, for example, eddy current type sensors 3A and 3B are applied, and these sensors 3A and 3B are disposed in the recesses of the electromagnets 2A and 2B (positions that can be sandwiched between the legs of the iron core 21). 1st sensor 3A, 3B and 2nd sensor 3A, 3B are set in the position which sets the detection surface to the same surface as the magnetic pole surface of each electromagnet 2A, 2B which respond | corresponds respectively, respectively, and opposes across the steel plate S. It has been. The first sensor 3A and the second sensor 3B detect the distances d1 and d2 to the steel plate S and output the detection results to the control unit 4 as detection signals. In the present embodiment, the sensors 3A and 3B are set so that the distance to the steel plate S can be detected only when the entire detection surfaces of the sensors 3A and 3B are completely or substantially completely covered by the steel plate S. . Each electromagnet pair 2 is associated with a pair of sensors 3A, 3B. In the following description, the pair of sensors 3A, 3B provided in association with one electromagnet pair 2 is simply referred to as “sensor 3”. Sometimes called. Here, as shown in FIG. 2, a layout in which the center (detection point) of the sensor 3 coincides or substantially coincides with the center 2c in the width direction of the electromagnet pair 2 is adopted, or as shown in FIG. The center (detection point) is made to coincide with or substantially coincide with the end of each electromagnet pair 2, more specifically, the end of the electromagnet pair 2 that is relatively far from the central portion 2Xc in the width direction of the electromagnet pair region 2X. A layout can also be adopted. As shown in FIGS. 2 and 5, among all the electromagnet pairs 2, the electromagnet pair 2 disposed in the central portion 2Xc in the width direction of the electromagnet pair region 2X (the electromagnet pair 2 with “iv” in FIG. 5). ) Is not provided with a sensor 3. This is because it is difficult to assume that the steel plate S meanders to the extent that the edge position of the steel plate S passes through the electromagnet pair 2 arranged in the width direction center portion 2Xc of the electromagnet pair region 2X. In addition, the sensor 3 is also provided in the electromagnet pair 2 disposed in the width direction center portion 2Xc of the electromagnet pair region 2X, and the sensor 3 detects the presence of the steel sheet S between the electromagnets 2A and 2B of the electromagnet pair 2. The electromagnetic damping device 1 may be configured to be forcibly stopped when it is determined that an abnormal situation has occurred when the electromagnet pair 2 is switched to an off state where the presence of the steel sheet S is not detected between the electromagnets 2A and 2B. In FIG. 2, the steel plate S in a normal state is indicated by a broken line.

  The electromagnetic damping device 1 according to the present embodiment is connected to the electromagnets 2A and 2B of the electromagnet pairs 2 and generates magnetic attraction forces of the electromagnets 2A and 2B based on the amount of current flowing through the electromagnets 2A and 2B. The control unit 4 includes a control unit 4 that controls the vibration of the steel sheet S that travels between the electromagnets 2A and 2B of each electromagnet pair 2 in a desired curved shape in the opposing direction of the first electromagnet 2A and the second electromagnet 2B. It is comprised so that it can suppress. Here, in the present embodiment, as the desired curved shape of the steel sheet S, a partial arc shape (partial elliptical shape) that is symmetric about the center in the width direction of the steel sheet S is adopted. Then, the target position of the steel sheet S in each electromagnet pair 2 (the desired target position: the position indicated by the black circles painted in FIG. 3) is input to the control unit 4 so that the steel sheet S has a desired curved shape. When the steel plate S is not meandering, the control unit 4 controls the current flowing through the electromagnets 2A and 2B so that the relative position of the steel plate S in each electromagnet pair 2 becomes the intended target position.

  The control unit 4 controls each electromagnet so as to suppress vibration of the steel sheet S based on the points electrically connected to the sensors 3A and 3B and the position information of the steel sheet S detected by the sensors 3A and 3B. Although the point which controls 2A and 2B magnetic attraction force is the same as that of a known electromagnetic damping device, the electromagnetic damping device 1 according to the present embodiment is different from the known electromagnetic damping device in the following points. .

  That is, as shown in FIG. 4, the control unit 4 in the electromagnetic vibration damping device 1 of the present embodiment is in an on state during the transfer of the steel sheet S at least in real time or every predetermined time when the steel sheet S is displaced in the width direction. Pseudo displacement amount calculating means 41 for calculating a pseudo change amount α ′, which is a pseudo displacement amount (meandering amount) in the width direction of the steel sheet S, using the position of the sensor 3 switched between the OFF state and the OFF state; Steel plate correction target position calculation means 42 for calculating the correction target position of the steel plate S in each electromagnet pair 2 based on the calculated pseudo displacement amount α ′ (pseudo meandering amount) and the meandering steel plate Current amount control means 43 for individually controlling the amount of current flowing through the electromagnets 2A and 2B constituting each electromagnet pair 2 so as to move S to the correction target position of the steel sheet S obtained by the steel plate correction target position calculation means 42; I have. Note that the control unit 4 includes information on the line L side from the host computer (not shown) electrically connected to the electromagnetic vibration damping device 1, that is, information relating to the traveling steel plate S, the plate thickness, the plate width, the steel type, It is configured to input tension and the like.

  The pseudo-displacement amount calculating means 41 is provided in the electromagnet pair region 2X in the sensor 3 that is switched from the on-state to the off-state from the steel plate center position Sc that is the center position in the width direction of the steel plate S in the normal state that does not meander in the width direction. The sensor (outermost sensor) farthest in the width direction center portion 2Xc of the electromagnet pair region 2X among the sensors 3 that are closest to the width direction center portion 2Xc or the sensor 3 that is switched from the off state to the on state. ) Is calculated as a pseudo displacement amount α ′ of the steel sheet S, and the difference between the distance to the “switching sensor reference position 3p” which is at least one of the positions) and the half length of the width dimension of the steel sheet S. Here, the pseudo displacement amount calculation means 42 includes a primary calculation unit that calculates a distance (temporary meandering width) from the steel plate center position Sc to the switching sensor reference position 3p, and a temporary meandering width calculated by the primary calculation unit. It can be understood that the pseudo displacement amount α ′ of the steel sheet S is calculated by the secondary calculation unit that calculates the difference between the length of the steel sheet S and the half length of the width dimension of the steel sheet S.

  The steel plate correction target position calculating means 42 is set in advance or in real time for each electromagnet pair 2 so as to have a desired curved shape in a state where the steel plate S is not meandering in addition to the above-described pseudo displacement amount α ′ of the steel plate S. The desired target position (the desired target position information) that is the target position of the steel sheet S and the distance between adjacent electromagnet pairs 2 (more specifically, the distance between the centers in the width direction of each electromagnet pair 2, hereinafter “electromagnet pair” The correction target position of the steel plate S in each electromagnet pair 2 is calculated for each electromagnet pair 2 by using a distance between the electromagnet pairs (electromagnetic pair distance information). As shown in FIGS. 5 and 6, which are partially enlarged views of FIG. 3, the electromagnetic vibration damping device 1 of the present embodiment includes a steel plate S that travels in the electromagnet pair region 2 </ b> X in a normal posture without being displaced in the width direction. The curved shape, that is, the desired curved shape of the steel plate S before meandering, and the bent line shape (the desired target position of the steel plate S) in which the desired target positions of the steel plates S in the adjacent electromagnet pair 2 are connected with a straight line. Are approximated by a broken line connecting the line segments in order: indicated by a broken line in FIGS. 5 and 6, and even when the steel sheet S meanders, the shape of the approximated steel sheet S is shown as a solid line in FIG. Based on the technical idea that the steel plate S has the same or substantially the same shape as the desired curved shape at the meandering position if it is translated and held in the width direction of the paired region 2X, the steel plate correction target position calculating means 42 Correction target of steel sheet S in electromagnet pair 2 The location, each place period target position of the steel sheet in the electromagnet pair 2 adjacent S, meandering amount of the steel sheet S, and requests by calculating by using an electromagnet pairs distance.

  As described above, the steel plate correction target position calculating means 42 linearly interpolates the desired target position of the steel plate S for each electromagnet pair 2 between the adjacent electromagnet pairs 2 (linear interpolation), and determines the distance between the electromagnet pair and the steel plate S. The correction target position of the meandering steel sheet S is derived by calculation using the pseudo displacement α ′. The distance between the adjacent electromagnet pairs 2 is determined in advance, and is input to the control unit 4 as “electromagnet distance information”. Further, the control unit 4 appropriately sets the timing for calculating the pseudo displacement amount α ′ by the pseudo displacement amount calculating means 41 and the timing for calculating the correction target position by the steel plate correction target position calculating means 42 in real time or every predetermined time. be able to.

  As shown in FIGS. 6 and 7 (FIG. 7 is a part of FIG. 6 and shows two right-angled triangles having a similar relationship, which will be described later), after being displaced in the width direction. The desired target of the steel sheet S in the target electromagnet pair 2 (T) for obtaining the corrected target position “x” of the steel sheet S (after meandering) (hereinafter referred to as “corrected target position calculation target electromagnet pair 2 (T)”). The position “S2” is an intended target position “S1” of the steel sheet S in the electromagnet pair 2 (N) adjacent to the corrected target position calculation target electromagnet pair 2 (T), and the intended target positions S1 and S2 are common xy. A line segment that can be shown as a coordinate difference “S2-S1” in the y-axis direction (the direction in which the first electromagnet 2A and the second electromagnet 2B face each other) when obtained as coordinates on a plane, and in the x-axis direction Electromagnet pairs that are spaced apart between adjacent electromagnet pairs 2 (T) and 2 (N) A right triangle formed by a line segment that can be shown as the distance “d” and a line segment that connects the desired target positions S2 and S1 of the steel sheet S in each of the electromagnets 2 (T) and 2 (N) (FIG. 7). The right triangle of the upper side of the drawing) represents the correction target position “x” of the steel plate S in the correction target position calculation target electromagnet pair 2 (T) and the desired target position “S1” of the steel plate S in the electromagnet pair 2 (N). A line segment that can be shown as a difference “x−S1” in the y-axis direction when obtained as coordinates on a common xy plane, a distance “d” between the electromagnet pair, and a pseudo displacement “α ′” of the steel sheet S A line segment extending in the x-axis direction that can be represented by the difference “d−α ′” and a line extending in parallel with a straight line connecting the desired target positions S2 and S1 of the steel sheet S from the corrected target position “x” of the steel sheet S And the right-angled triangle formed by the minute (the right-angled triangle on the lower side of FIG. 7) By utilizing the fact that in the electromagnetic damping device 1 of the present embodiment performs the following processing in steel corrected target position calculating means 42 of the control unit 4.

  Specifically, the steel plate correction target position calculation means 42 of the present embodiment calculates the y-axis direction (the first electromagnet 2A and the second electromagnet 2B) when the desired target positions S1 and S2 are obtained as coordinates on a common xy plane. The coordinate difference “S2−S1” in the opposite direction), the correction target position “x” of the steel plate S, and the intended target position “S1” of the steel plate S in the electromagnet pair 2 (N) are on the common xy plane. The difference “x−S1” in the y-axis direction and the first relative ratio “(S2−S1) :( x−S1)”, which is the ratio of these two, is the distance “d” between the electromagnets. And the difference “d−α ′” between the distance “d” between the electromagnet pair and the pseudo displacement amount (pseudo meandering amount) “α ′” of the steel sheet S, the second relative ratio “d :( d−α ′) ”, the correction target position“ of the steel sheet S in the correction target position calculation target electromagnet pair 2 (T) ” Seek ". That is, the steel plate correction target position calculating means 42 is an equation that connects the first relative ratio “(S2−S1) :( x−S1)” and the second relative ratio “d: (d−α ′)” by an equation. That is, from “(S2−S1) :( x−S1) = d: (d−α ′)”, the correction target position “x” of the steel sheet S in the correction target position calculation target electromagnet pair 2 (T) is calculated. Is what you want. When the above formula “(S2−S1) :( x−S1) = d: (d−α ′)” is expanded into a formula for obtaining “x”, “x = ((S2−S1) (d−α ′)”. ) / D) + S1 ”, and“ S2 ”,“ S1 ”,“ d ”, and“ α ′ ”are input to the control unit 4 respectively, and the desired target position information of the steel sheet S in the adjacent electromagnet pair 2, the electromagnet pair By substituting numerical values based on the inter-distance information and the pseudo displacement information of the steel sheet S, the corrected target position “x” of the steel sheet S in the correction target position calculation target electromagnet pair 2 (T) can be obtained. In the present embodiment, the correction target position “x” of the steel plate S in each electromagnet pair 2 is obtained as a numerical value by the steel plate correction target position calculation means 42 by such calculation processing.

  The current amount control means 43 temporarily replaces the target position of the steel plate S in each electromagnet pair 2 with the corrected target position “x” obtained by the steel plate correction target position calculation means 42 from the intended target position, and in each electromagnet pair 2. The electromagnets 2A and 2B constituting each electromagnet pair 2 are set to an excited state or a non-excited state so that the position of the steel plate S moves from the intended target position to the corrected target position. If it is determined that the steel plate S does not exist between the first electromagnet 2A and the second electromagnet 2B based on the pseudo displacement information, the electromagnets 2A and 2B constituting the electromagnet pair 2 and each The sensors 3A and 3B may not be driven.

  Although not shown, the control unit 4 includes a controller to which output signals from the sensors 3A and 3B are input, a sequencer that outputs commands related to control gain to the controller, and the electromagnets 2A and 2B output by the controller. A first amplifier and a second amplifier for supplying current to each of the electromagnets 2A and 2B based on a command (current amount control information) relating to a current to be flown are provided. Description is omitted.

  Next, the usage method and operation of the electromagnetic damping device 1 having such a configuration will be described.

  First, when the electromagnetic damping device 1 is activated, desired target position information and distance information between the electromagnets of the steel plate S in each electromagnet pair 2 are input to the control unit 4, and the control unit 4 places the steel plate S in each electromagnet pair 2. By controlling the current amount of each of the electromagnets 2A and 2B based on the target position information, as shown in FIGS. 1 and 3, the steel sheet S traveling without meandering while being pulled up through the molten zinc tank Z The vibration can be suppressed while maintaining the desired curved shape.

  By the way, even when the traveling steel plate S meanders, when the control unit 4 continues to control the current amount of each electromagnet 2A, 2B based on the desired target position information of the steel plate S in each electromagnet pair 2, that is, When the target position of the steel plate S in the electromagnet pair 2 is kept at the desired target position, the steel plate S is deformed into a shape different from the intended curved shape as shown in FIG. There is a risk that it is not possible to exert a sufficient damping effect.

  Therefore, in the electromagnetic damping device 1 of the present embodiment, the electromagnetic damping control program according to the present embodiment is executed in real time or at predetermined time intervals to operate each unit as follows. That is, the pseudo displacement amount α ′ of the steel sheet S traveling is calculated by the pseudo displacement amount calculating means 41 of the control unit 4 (pseudo displacement amount calculating step S1; see FIG. 9). Specifically, as shown in FIGS. 11 and 12, in a normal state, the electromagnet pair 2 at both ends (ends) 2Xe in the width direction of the electromagnet pair region 2X (the electromagnet pair “i” shown in FIGS. 11 and 12, The steel sheet S having a width dimension that turns off the sensor 3 attached to “vii”) meanders to one end side in the width direction of the electromagnet pair region 2X (left side in FIG. 11 and right side in FIG. 12). The sensor 3 attached to the electromagnet pair 2 disposed on the one end side 2Xe (the sensor 3 attached to the leftmost electromagnet pair “vii” in FIG. 11 and the rightmost electromagnet pair “i” in FIG. 12) When only the sensor 3) is switched from the OFF state to the ON state, the pseudo displacement amount calculation unit 41 calculates the pseudo displacement amount α ′ according to the following procedure. That is, among the sensors 3 switched from the off state to the on state, the position of the sensor 3 (outermost sensor 3) farthest from the width direction central portion 2Xc of the electromagnet pair region 2X is defined as the switching sensor reference position 3p. A distance from the position 3p to the steel plate center position Sc is calculated, a difference between the distance and a half length of the width dimension of the steel plate S is calculated, and the calculated value is set as a pseudo displacement amount α ′. Here, as shown in FIGS. 11 and 12, when there is no sensor 3 that is switched from the on state to the off state due to meandering of the steel sheet S, the sensor that is switched from the above-described off state to the on state (attached to the electromagnet pair vii). The pseudo displacement amount α ′ can be obtained by paying attention only to the sensor 3 or the sensor 3) attached to the electromagnet pair i. In such a case, that is, when the pseudo displacement amount α ′ is obtained by paying attention only to the sensor 3 in which the steel plate S meanders and switches from the off state to the on state, the expression “(from the steel plate center position Sc to the switching sensor reference position is Distance to 3p) -half the width dimension of the steel sheet S ".

  Further, as shown in FIGS. 13 and 14, for example, in the normal state, the electromagnetic pair 2 (the electromagnet pairs “i” and “vii” shown in FIGS. 13 and 14) at both ends 2Xc in the width direction of the electromagnet pair region 2X is incidental. The steel plate S that has a width dimension in which the sensor 3 is turned off and that is smaller than the steel sheet S shown in FIGS. 11 and 12 is connected to one end 2Xe side of the electromagnet pair arrangement region 2X (FIG. 13). In FIG. 13, the sensor 3 meanders on the left side of the paper and the right side of the paper in FIG. 14 and is attached to the electromagnet pair 2 arranged on the other end side (in FIG. 13, the sensor 3 attached to the second electromagnet pair “vi” from the right). 14, when the sensor 3) attached to the second electromagnet pair “ii” from the left is switched from the on state to the off state, the pseudo displacement amount calculation unit 41 calculates the pseudo displacement amount α ′ by the following procedure. calculate. That is, among the sensors 3 switched from the on state to the off state, the position of the sensor 3 (innermost sensor 3) closest to the width direction center portion 2Xc of the electromagnet pair region 2X is defined as the switching sensor reference position 3p. The distance from the position 3p to the steel plate center position Sc is calculated, the difference between the distance and the half length of the width dimension of the steel plate S is calculated, and the calculated value is set as the pseudo displacement amount α ′. Here, as shown in FIGS. 13 and 14, when there is no sensor 3 that switches from the off state to the on state due to meandering of the steel sheet S, the sensor 3 that has been switched from the on state to the off state described above (right in FIG. 13). The pseudo displacement amount α ′ can be obtained by paying attention only to the sensor 3 attached to the second electromagnet pair “vi” from FIG. 14 and the sensor 3 attached to the second electromagnet pair “ii” from the left in FIG. it can. In this case, that is, when the pseudo displacement amount α ′ is obtained by paying attention only to the sensor 3 in which the steel sheet S meanders and switches from the on state to the off state, the expression “half the width dimension of the steel sheet S− (steel plate Distance from the center position Sc to the switching sensor reference position 3p). In addition, in FIG. 11 thru | or FIG. 14, the steel plate S of a normal state is shown as the continuous line, and the meandering steel plate S is shown with the broken line.

  Next, when the electromagnetic damping device 1 according to the present embodiment determines that the steel sheet S is meandering based on the pseudo displacement amount α ′ calculated by the pseudo displacement amount calculation means 41, the control unit 4 is a corrected target position calculating means for calculating the corrected target position x of the steel sheet S in each electromagnet pair 2 based on the meandering amount information of the steel sheet S, the desired target position information of the steel sheet S in each electromagnet pair 2, and the distance information between the electromagnets. Calculated by 42 (steel plate correction target position calculation step S2; see FIG. 9). Specifically, the corrected target position calculation means 42 uses the above-described mathematical expression “x = ((S2−S1) (d−α ′) / d) + S1”, and “S2”, “S1”, “d ”And“ α ′ ”, the numerical values based on the desired target position information of the steel sheet S, the distance information between the electromagnet pairs and the meandering amount information of the steel sheet S input to the control unit 4 are substituted, and each electromagnet pair 2 (T ) To obtain the correction target position “x” of the steel sheet S.

  Next, the control unit 4 calculates and obtains the target position of the steel sheet S in each electromagnet pair 2 by the corrected target position calculation means 42 in the steel plate correction target position calculation step S2 instead of the intended target position. Based on the corrected target position “x”, the current amount control means 43 individually controls the amount of current flowing through the electromagnets 2A and 2B so that the position of the steel plate S meandering with respect to each electromagnet pair 2 moves to the corrected target position. Control (current amount control step S3; see FIG. 9). Note that the electromagnetic damping device X of the present embodiment provides the current amount information from the control unit 4 to make the first electromagnet 2A and the second electromagnet 2B constituting each electromagnet pair 2 individually excited or non-excited. Output to the electromagnets 2A and 2B. As a result, the electromagnetic damping device 1 of the present embodiment can keep the steel plate S in the desired curved shape at the meandering position as shown by the solid line in FIG. 10, and the steel plate S traveling in this desired curved shape. Can exhibit an appropriate vibration control action. In addition, in FIG. 10, the steel plate S which travels in a normal posture without meandering with the desired curved shape is indicated by a broken line.

  Thus, when the steel plate S traveling in a curved shape meanders, the electromagnetic vibration damping device 1 of the present embodiment performs vibration damping control while keeping the steel plate S in a desired curved shape at the meandering position. Can do.

  In the electromagnetic vibration damping device 1 of the present embodiment, information on the position of the steel plate S that travels while being pulled up through the molten zinc tank Z in each electromagnet pair 2 is the first sensor 3A and the second sensor 2A. The detection information (position information) from the sensors 3A and 3B is input to the control unit 4 in real time or at predetermined time intervals. Then, based on the detection information (position information) and the correction target position information, the control unit 4 controls the current amount control information for bringing the first electromagnet 2A and the second electromagnet 2B into the excited state or the current amount for making the non-excited state. Control information is output to each electromagnet 2A, 2B, and the electric current sent through each electromagnet 2A, 2B is controlled. As a result, the steel sheet S is maintained in the same or substantially the same curved shape as the intended curved shape by the magnetic attractive force of the electromagnets 2A and 2B, not only when traveling without meandering but also when meandering. Vibration during traveling is suppressed.

  Therefore, the curved steel plate S and the air knife portion A are configured while maintaining the rigidity of the steel plate S by curving the steel plate S traveling while being pulled up through the molten zinc tank Z in the thickness direction. The distance from each nozzle A1 to the ejection port can be maintained within a predetermined range, and the fluctuation of the injection force acting on the steel sheet S can be prevented, and a uniform or almost uniform plating thickness can be achieved. .

  As described above, in the electromagnetic damping device 1 according to this embodiment, the position of the outermost sensor 3 among the sensors 3 attached to the electromagnet pair 2 and switched from the on state to the off state, or the off state. The position of the innermost sensor 3 among the sensors 3 switched from ON to OFF is set as the switching sensor reference position 3p, and the pseudo displacement amount obtained by calculating the pseudo displacement amount α ′ of the steel sheet S based on the switching sensor reference position 3p. A calculating means 41; a steel plate correction target position calculating means 42 for calculating and calculating a correction target position x of the steel sheet S in each electromagnet pair 2 based on the pseudo displacement α ′ of the steel sheet S calculated by the pseudo displacement amount calculating means 41; The current amount control means 4 for individually controlling the amount of current flowing through the electromagnets 2A and 2B so that the meandering steel sheet S is moved to the correction target position x of the steel sheet S obtained by the steel sheet correction target position calculation means 42. 3 is used. Here, the pseudo displacement amount α ′ obtained by the pseudo displacement amount calculation means 41 may be different from the actual displacement amount α of the steel sheet S, but the error is at most between the electromagnet pairs 2 adjacent in the width direction of the electromagnet pair region 2X. More specifically, it is about the distance between the detection points of the sensors 3 attached to the adjacent electromagnet pairs 2, which is an error that hardly causes a problem in actual operation. Accordingly, the pseudo displacement amount α ′, which is an error within an allowable range in actual operation, is calculated using the sensor 3 that detects position information in the thickness direction of the steel sheet S (vibration information of the steel sheet S). In the electromagnetic damping device 1 according to the present embodiment configured to calculate the target correction position x of the steel sheet S using the pseudo displacement amount α ′, position information (thickness of the steel sheet S) of the steel sheet S is obtained. It is not necessary to arrange a sensor for detecting the edge position of the steel sheet S and a meandering amount detection device capable of directly detecting the meandering amount of the steel sheet S separately from the sensor 3 for detecting the vibration information), and the steel plate correction target position calculating means. Even if the steel plate S traveling in a curved shape is meandered appropriately and reliably controlling whether or not the electromagnets 2A and 2B are excited based on the target correction position information of the steel plate S obtained in 42. Place the steel sheet S at the meandering position It can be guided so as to be the same or substantially the same as the curved shape of the period, and vibration during traveling can be appropriately suppressed even for the steel sheet S meandering in the width direction. As a result, it is possible to effectively suppress the vibration of the steel sheet S that travels meandering in the width direction as well as the steel sheet S that travels in a normal posture with the desired curved shape, and is excellent in practicality. It will be a thing. Therefore, when such an electromagnetic damping device 1 is disposed in the continuous plated steel plate line L together with the air knife part A that blows off the excess molten metal adhering to the steel plate S, the electromagnetic damping device 1 can It is possible to effectively suppress the vibration of the steel sheet S that travels in the curved shape that matches or substantially matches the desired curved shape, and as a result, the distance between the steel plate S and the air knife part A. Can be maintained within a predetermined range, and fluctuations in the injection force acting on the steel sheet S can be prevented, and a uniform or almost uniform plating thickness can be achieved.

  In addition, the electromagnetic damping program according to the present embodiment uses the pseudo displacement amount α ′ obtained using the position information of the sensor 3 attached to the electromagnet pair 2 as the pseudo displacement amount calculation step S1 and the pseudo displacement amount calculation step. Based on the pseudo-displacement amount α ′ obtained in S1, the steel plate correction target position calculating step S2 obtained by calculating the correction target position x of the steel sheet S in each electromagnet pair 2 so as to have an intended curved shape meandered. In order to go through the current amount control step S3 for individually controlling the amount of current flowing through the electromagnets 2A and 2B so as to move the steel plate S to the correction target position x of the steel plate S obtained in the steel plate correction target position calculation step S2, it was described above. As a result, it is possible to appropriately suppress vibrations of the steel sheet S traveling in a normal posture without meandering and the steel sheet S traveling meandering in the width direction.

  In addition, this invention is not limited to embodiment mentioned above. For example, for example, when there are both a sensor that has been switched from an on state to an off state and a sensor that has been switched from an off state to an on state, the pseudo-displacement amount calculation unit is the innermost sensor among the sensors that have been switched from the on state to the off state. The position of each sensor, the position of the outermost sensor among the sensors switched from the OFF state to the ON state, and the position of both of these sensors are used as the switching sensor reference positions to determine the respective pseudo displacement amounts, and the values are added and divided by two. The calculated value (average value) can be calculated as the pseudo displacement amount, or the pseudo displacement amount can be calculated by using one of the switching sensor reference positions preferentially.

  In addition, the relative position of the sensor with respect to each electromagnet pair may be changed as appropriate, and the detection point of the sensor is made to coincide with the center part in the width direction of the electromagnet pair or displaced from the center part in the width direction of the electromagnet pair toward the end in the width direction. Can be set to a different position.

  Moreover, instead of the partial circular arc (partial elliptical arc) shown in the above-described embodiment, the desired curved shape of the steel sheet is a shape (wave shape, S-shaped) that combines a plurality of partial arcs, or the center in the width direction. It is possible to adopt a curved shape that is not symmetrical.

  Further, the output source that outputs the intended target position of the steel plate and the distance between the electromagnets to the control unit may be either a device different from the electromagnetic vibration damping device or a part of the electromagnetic vibration damping device.

  In addition, the current amount control means controls the current amount of the electromagnet by adjusting the output intensity (the amount of current flowing through the electromagnet) in addition to the current output on / off or in place of the current output on / off. It doesn't matter. In particular, when the current amount control means does not control on / off switching of the current output, but adjusts the output intensity without turning off the current output (making the electromagnet unexcited) Instead of the current output off state (non-excitation state of the electromagnet) in the above-described embodiment, the steel plate between the electromagnet pairs is not moved in the width direction depending on the magnetic attraction force of the electromagnet or is ignored even if it is moved. It is desirable to pass a weak current that can move only a minimal distance. If such current control is performed, a weak current is always output even in a state where the steel plate is not moved in the width direction, compared to a mode in which current output on / off control is performed. Responsiveness when raising the current output so as to be moved to improve the vibration damping control efficiency of the steel sheet. You may control the electric current amount of each electromagnet by adjusting output intensity.

  Further, the output source for outputting the width dimension of the steel plate to the control unit may be either a device different from the electromagnetic damping device or a part of the electromagnetic damping device.

  The number of electromagnet pairs arranged in the width direction of the steel plate and the pitch between the electromagnet pairs adjacent in the width direction of the steel plate (numerical values based on the distance information between the electromagnets) can be appropriately changed. Moreover, you may set the pitch of the electromagnet pairs adjacent to the width direction unevenly. In this case, the pitch of the sensors attached to the electromagnet pair may also be non-uniform, but the maximum error between the actual displacement amount (meandering amount) of the steel sheet and the pseudo displacement amount is the distance between the sensors with the largest pitch (specifically, Is a separation distance between detection points having the largest pitch). Further, the width dimension of the electromagnet pair region may be appropriately changed according to the change in the number of electromagnet pairs and the pitch between the electromagnet pairs.

  In the above-described embodiment, among all the electromagnet pairs, the sensor 3 is attached to the electromagnet pair 2 (the electromagnet pair 2 marked with “iv” in FIG. 11) disposed in the widthwise central portion 2Xc of the electromagnet pair region 2X. Although the embodiment not illustrated is exemplified, the electromagnet pair 2 “iii”, “v” adjacent to the electromagnet pair 2 “iv” is an electromagnet pair disposed in the vicinity of the central portion 2Xc in the width direction of the electromagnet pair region 2X, A mode in which the sensor 3 is not attached to the electromagnet pair 2 may be employed. Furthermore, when the electromagnet pairs are arranged in an even number in the width direction of the electromagnet pair region, it is not necessary to attach a sensor to at least two electromagnet pairs near the central portion in the width direction of the electromagnet pair region.

  Moreover, although the molten zinc tank was illustrated as a molten metal tank in embodiment mentioned above, it may replace with this, for example, you may apply the tank which stored the molten tin, aluminum, or resin paint. In the electromagnetic damping device of the present invention, as the surface coating treatment for the steel sheet, in addition to the plating coating treatment, other surface treatment such as surface coloring treatment for applying a surface coating treatment by spraying an appropriate surface treatment material onto the steel sheet. A coating process can be employed. In addition, the electromagnetic vibration damping device of the present invention suitably suppresses vibration of a steel plate that travels before the surface coating treatment and vibration suppression of a steel plate that travels in a predetermined direction without performing the surface coating treatment. Can do.

  Still further, the electromagnetic damping device of the present invention is a device that suppresses and controls the vibration of a steel plate that passes between the electromagnets while being pulled down after the surface coating treatment, or is horizontal after the surface coating treatment. It may be a device that suppresses and controls the vibration of the steel plate that is passed between the electromagnets while being moved. Further, in the above-described embodiment, the case where the posture of the steel plate passing between the electromagnets is vertical is shown. However, in the present invention, the steel plate passes between the electromagnets in any posture other than vertical, for example, a horizontal posture or an inclined posture. It can also be done.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic damping device 2 ... Electromagnet pair 2A, 2B ... Electromagnet 4 ... Control part 41 ... Pseudo displacement amount calculation means 42 ... Steel plate correction target position calculation means 43 ... Current amount control means S ... Steel plate

Claims (4)

A plurality of electromagnet pairs, which are sets of electromagnets arranged opposite to each other in the thickness direction of a steel plate traveling in a predetermined direction, are arranged in the width direction of the steel plate, and the electromagnets of the electromagnet pairs are controlled by a control unit that controls the current flowing through each electromagnet. An electromagnetic damping device that suppresses vibration of a steel plate that travels in a shape curved in the opposite direction of an electromagnet,
The presence or absence of a steel plate between the electromagnets of the electromagnet pair can be detected in each electromagnet pair excluding the electromagnet pair arranged in the widthwise central portion of the electromagnet pair region where the electromagnet pairs are arranged in the widthwise direction or in the vicinity of the widthwise central portion. With a simple sensor,
The control unit is
The presence of the steel plate is not detected between the electromagnets of the electromagnet pair from the on state where the presence of the steel plate is detected between the electromagnets of the electromagnet pair from the middle position of the steel plate in the widthwise middle position of the steel plate in the normal state not meandering in the width direction Of the sensors switched to the off state, the position of the sensor closest to the central portion in the width direction of the electromagnet pair region, or among the sensors switched from the off state to the on state, farthest from the central portion in the width direction of the electromagnet pair region A pseudo displacement amount calculating means for calculating a difference between a distance to the switching sensor reference position based on at least one of the sensor positions and a half length of the width of the steel plate as a pseudo displacement amount of the steel plate;
Based on the pseudo displacement amount calculated by the pseudo displacement amount calculating means, a steel plate correction target position calculating means for calculating a correction target position of the steel sheet between the electromagnets constituting each electromagnet pair so as to have an intended curved shape;
The amount of current for individually controlling the amount of current flowing through the electromagnets constituting each electromagnet pair so as to move the steel plate displaced in the width direction to the correction target position of the steel plate in each electromagnet pair obtained by the steel plate correction target position calculating means An electromagnetic vibration control device comprising a control means. Approximate the desired curved shape of the steel plate before the displacement in the width direction with a straight line connecting the desired target positions of the steel plate in the adjacent electromagnet pair,
The steel plate correction target position calculation means, for each electromagnet pair, each target target position of the steel plate in the electromagnet pair for which the correction target position of the steel plate is to be obtained and the electromagnet pair adjacent to the electromagnet pair and the pseudo displacement amount are adjacent to each other. The electromagnetic damping device according to claim 1, wherein the correction target position of the steel plate is calculated using a distance between the electromagnet pair. The steel plate correction target position calculation means,
The desired target position of the steel plate in the target electromagnet pair for which the correction target position of the steel plate is to be obtained and the desired target position of the steel plate in the electromagnet pair adjacent to the electromagnet pair are obtained as coordinates, and the difference between these coordinates is calculated. In addition, the difference between the corrected target position of the steel plate in the target electromagnet pair for which the corrected target position is obtained and the desired target position of the steel plate in the electromagnet pair adjacent to the electromagnet pair is calculated, and the ratio of the difference between these two calculation results The first relative ratio is
Each correction target position of the steel plate in each electromagnet pair is obtained by using the fact that the distance between adjacent electromagnet pairs is equal to the second relative ratio that is the ratio calculated by subtracting the pseudo displacement amount from the separation distance. The electromagnetic damping device according to claim 1 or 2, wherein the electromagnetic damping device is obtained. An electromagnetic damping control program applied to the electromagnetic damping device according to any one of claims 1 to 3,
The presence of the steel plate is not detected between the electromagnets of the electromagnet pair from the on state where the presence of the steel plate is detected between the electromagnets of the electromagnet pair from the middle position of the steel plate in the widthwise middle position of the steel plate in the normal state not meandering in the width direction The position of the sensor closest to the center in the width direction of the electromagnet pair region among the sensors switched to the off state, or the position of the sensor farthest from the center portion in the width direction of the electromagnet pair region among the sensors switched from the off state to the on state A pseudo displacement amount calculating step for calculating a difference between the distance to the switching sensor reference position based on at least one of the above and a half length of the width dimension of the steel plate as a pseudo displacement amount of the steel plate;
Based on the pseudo displacement amount calculated in the pseudo displacement amount calculating step, a steel plate correction target position calculating step for calculating a correction target position of the steel plate between the electromagnets constituting each electromagnet pair so as to have an intended curved shape;
The amount of current for individually controlling the amount of current flowing through the electromagnets constituting each electromagnet pair so as to move the steel plate displaced in the width direction to the correction target position of the steel plate in each electromagnet pair obtained in the steel plate correction target position calculating step An electromagnetic damping control program characterized by undergoing a control step.

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